I haven't noticed my DPT getting any louder on my .223 compared to any of my others and I can nearly poke my index finger through the first baffle it has had that many shots fired through it. Never cleaned it and other than a bit of corrosion there doesn't seem to be a huge deal of build up either.
Be getting replaced at some stage so be interesting to see if the new one is notably any quieter to the ear.
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